i just did a auto to stick conversion in my 2000 integra,and i just bought a obd 1 conversion harness,but my stock ecu has 4 plugs and the pigtail has 3 only,isnt one suppose to go the the chassis?is it a automatic thing?or im i tripping,i tryed three different pigtail,none worked.tryed search

 

you need a manual ecu, if you're using your stock auto one it won't work.